1 13b2bc37 2022-10-23 stsp /*
   2 13b2bc37 2022-10-23 stsp  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
   3 13b2bc37 2022-10-23 stsp  *
   4 13b2bc37 2022-10-23 stsp  * Permission to use, copy, modify, and distribute this software for any
   5 13b2bc37 2022-10-23 stsp  * purpose with or without fee is hereby granted, provided that the above
   6 13b2bc37 2022-10-23 stsp  * copyright notice and this permission notice appear in all copies.
   7 13b2bc37 2022-10-23 stsp  *
   8 13b2bc37 2022-10-23 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 13b2bc37 2022-10-23 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 13b2bc37 2022-10-23 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 13b2bc37 2022-10-23 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 13b2bc37 2022-10-23 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 13b2bc37 2022-10-23 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 13b2bc37 2022-10-23 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 13b2bc37 2022-10-23 stsp  */
  16 13b2bc37 2022-10-23 stsp 
  17 13b2bc37 2022-10-23 stsp #include <sys/types.h>
  18 13b2bc37 2022-10-23 stsp #include <sys/queue.h>
  19 13b2bc37 2022-10-23 stsp #include <sys/uio.h>
  20 13b2bc37 2022-10-23 stsp 
  21 13b2bc37 2022-10-23 stsp #include <errno.h>
  22 13b2bc37 2022-10-23 stsp #include <event.h>
  23 13b2bc37 2022-10-23 stsp #include <poll.h>
  24 13b2bc37 2022-10-23 stsp #include <limits.h>
  25 13b2bc37 2022-10-23 stsp #include <sha1.h>
  26 13b2bc37 2022-10-23 stsp #include <stdio.h>
  27 13b2bc37 2022-10-23 stsp #include <stdint.h>
  28 13b2bc37 2022-10-23 stsp #include <stdlib.h>
  29 13b2bc37 2022-10-23 stsp #include <string.h>
  30 13b2bc37 2022-10-23 stsp #include <imsg.h>
  31 13b2bc37 2022-10-23 stsp #include <unistd.h>
  32 13b2bc37 2022-10-23 stsp 
  33 13b2bc37 2022-10-23 stsp #include "got_error.h"
  34 13b2bc37 2022-10-23 stsp #include "got_serve.h"
  35 13b2bc37 2022-10-23 stsp #include "got_path.h"
  36 13b2bc37 2022-10-23 stsp #include "got_version.h"
  37 13b2bc37 2022-10-23 stsp #include "got_reference.h"
  38 13b2bc37 2022-10-23 stsp 
  39 13b2bc37 2022-10-23 stsp #include "got_lib_pkt.h"
  40 13b2bc37 2022-10-23 stsp #include "got_lib_dial.h"
  41 13b2bc37 2022-10-23 stsp #include "got_lib_gitproto.h"
  42 13b2bc37 2022-10-23 stsp #include "got_lib_sha1.h"
  43 13b2bc37 2022-10-23 stsp #include "got_lib_poll.h"
  44 13b2bc37 2022-10-23 stsp 
  45 13b2bc37 2022-10-23 stsp #include "gotd.h"
  46 13b2bc37 2022-10-23 stsp 
  47 13b2bc37 2022-10-23 stsp #ifndef nitems
  48 13b2bc37 2022-10-23 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  49 13b2bc37 2022-10-23 stsp #endif
  50 13b2bc37 2022-10-23 stsp 
  51 13b2bc37 2022-10-23 stsp static const struct got_capability read_capabilities[] = {
  52 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
  53 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_OFS_DELTA, NULL },
  54 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
  55 13b2bc37 2022-10-23 stsp };
  56 13b2bc37 2022-10-23 stsp 
  57 13b2bc37 2022-10-23 stsp static const struct got_capability write_capabilities[] = {
  58 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
  59 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_OFS_DELTA, NULL },
  60 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_REPORT_STATUS, NULL },
  61 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_NO_THIN, NULL },
  62 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_DELETE_REFS, NULL },
  63 13b2bc37 2022-10-23 stsp };
  64 13b2bc37 2022-10-23 stsp 
  65 9aeaf23a 2023-01-22 op const struct got_error *
  66 9aeaf23a 2023-01-22 op got_serve_parse_command(char **command, char **repo_path, const char *gitcmd)
  67 13b2bc37 2022-10-23 stsp {
  68 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
  69 13b2bc37 2022-10-23 stsp 	size_t len, cmdlen, pathlen;
  70 13b2bc37 2022-10-23 stsp 	char *path0 = NULL, *path, *abspath = NULL, *canonpath = NULL;
  71 13b2bc37 2022-10-23 stsp 	const char *relpath;
  72 13b2bc37 2022-10-23 stsp 
  73 13b2bc37 2022-10-23 stsp 	*command = NULL;
  74 13b2bc37 2022-10-23 stsp 	*repo_path = NULL;
  75 13b2bc37 2022-10-23 stsp 
  76 13b2bc37 2022-10-23 stsp 	len = strlen(gitcmd);
  77 13b2bc37 2022-10-23 stsp 
  78 13b2bc37 2022-10-23 stsp 	if (len >= strlen(GOT_SERVE_CMD_SEND) &&
  79 13b2bc37 2022-10-23 stsp 	    strncmp(gitcmd, GOT_SERVE_CMD_SEND,
  80 13b2bc37 2022-10-23 stsp 	    strlen(GOT_SERVE_CMD_SEND)) == 0)
  81 13b2bc37 2022-10-23 stsp 		cmdlen = strlen(GOT_SERVE_CMD_SEND);
  82 13b2bc37 2022-10-23 stsp 	else if (len >= strlen(GOT_SERVE_CMD_FETCH) &&
  83 13b2bc37 2022-10-23 stsp 	    strncmp(gitcmd, GOT_SERVE_CMD_FETCH,
  84 13b2bc37 2022-10-23 stsp 	    strlen(GOT_SERVE_CMD_FETCH)) == 0)
  85 13b2bc37 2022-10-23 stsp 		cmdlen = strlen(GOT_SERVE_CMD_FETCH);
  86 13b2bc37 2022-10-23 stsp 	else
  87 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PACKET);
  88 13b2bc37 2022-10-23 stsp 
  89 13b2bc37 2022-10-23 stsp 	if (len <= cmdlen + 1 || gitcmd[cmdlen] != ' ')
  90 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PACKET);
  91 13b2bc37 2022-10-23 stsp 
  92 13b2bc37 2022-10-23 stsp 	if (memchr(&gitcmd[cmdlen + 1], '\0', len - cmdlen) == NULL)
  93 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PATH);
  94 13b2bc37 2022-10-23 stsp 
  95 13b2bc37 2022-10-23 stsp 	/* Forbid linefeeds in paths, like Git does. */
  96 13b2bc37 2022-10-23 stsp 	if (memchr(&gitcmd[cmdlen + 1], '\n', len - cmdlen) != NULL)
  97 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PATH);
  98 13b2bc37 2022-10-23 stsp 
  99 13b2bc37 2022-10-23 stsp 	path0 = strdup(&gitcmd[cmdlen + 1]);
 100 13b2bc37 2022-10-23 stsp 	if (path0 == NULL)
 101 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("strdup");
 102 13b2bc37 2022-10-23 stsp 	path = path0;
 103 13b2bc37 2022-10-23 stsp 	pathlen = strlen(path);
 104 13b2bc37 2022-10-23 stsp 
 105 13b2bc37 2022-10-23 stsp 	/*
 106 13b2bc37 2022-10-23 stsp 	 * Git clients send a shell command.
 107 13b2bc37 2022-10-23 stsp 	 * Trim spaces and quotes around the path.
 108 13b2bc37 2022-10-23 stsp 	 */
 109 13b2bc37 2022-10-23 stsp 	while (path[0] == '\'' || path[0] == '\"' || path[0] == ' ') {
 110 13b2bc37 2022-10-23 stsp 		path++;
 111 13b2bc37 2022-10-23 stsp 		pathlen--;
 112 13b2bc37 2022-10-23 stsp 	}
 113 13b2bc37 2022-10-23 stsp 	while (pathlen > 0 &&
 114 13b2bc37 2022-10-23 stsp 	    (path[pathlen - 1] == '\'' || path[pathlen - 1] == '\"' ||
 115 13b2bc37 2022-10-23 stsp 	    path[pathlen - 1] == ' ')) {
 116 13b2bc37 2022-10-23 stsp 		path[pathlen - 1] = '\0';
 117 13b2bc37 2022-10-23 stsp 		pathlen--;
 118 13b2bc37 2022-10-23 stsp 	}
 119 13b2bc37 2022-10-23 stsp 
 120 13b2bc37 2022-10-23 stsp 	/* Deny an empty repository path. */
 121 13b2bc37 2022-10-23 stsp 	if (path[0] == '\0' || got_path_is_root_dir(path)) {
 122 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NOT_GIT_REPO);
 123 13b2bc37 2022-10-23 stsp 		goto done;
 124 13b2bc37 2022-10-23 stsp 	}
 125 13b2bc37 2022-10-23 stsp 
 126 13b2bc37 2022-10-23 stsp 	if (asprintf(&abspath, "/%s", path) == -1) {
 127 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("asprintf");
 128 13b2bc37 2022-10-23 stsp 		goto done;
 129 13b2bc37 2022-10-23 stsp 	}
 130 13b2bc37 2022-10-23 stsp 	pathlen = strlen(abspath);
 131 13b2bc37 2022-10-23 stsp 	canonpath = malloc(pathlen);
 132 13b2bc37 2022-10-23 stsp 	if (canonpath == NULL) {
 133 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("malloc");
 134 13b2bc37 2022-10-23 stsp 		goto done;
 135 13b2bc37 2022-10-23 stsp 	}
 136 13b2bc37 2022-10-23 stsp 	err = got_canonpath(abspath, canonpath, pathlen);
 137 13b2bc37 2022-10-23 stsp 	if (err)
 138 13b2bc37 2022-10-23 stsp 		goto done;
 139 13b2bc37 2022-10-23 stsp 
 140 13b2bc37 2022-10-23 stsp 	relpath = canonpath;
 141 13b2bc37 2022-10-23 stsp 	while (relpath[0] == '/')
 142 13b2bc37 2022-10-23 stsp 		relpath++;
 143 13b2bc37 2022-10-23 stsp 	*repo_path = strdup(relpath);
 144 13b2bc37 2022-10-23 stsp 	if (*repo_path == NULL) {
 145 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("strdup");
 146 13b2bc37 2022-10-23 stsp 		goto done;
 147 13b2bc37 2022-10-23 stsp 	}
 148 13b2bc37 2022-10-23 stsp 	*command = strndup(gitcmd, cmdlen);
 149 13b2bc37 2022-10-23 stsp 	if (*command == NULL)
 150 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("strndup");
 151 13b2bc37 2022-10-23 stsp done:
 152 13b2bc37 2022-10-23 stsp 	free(path0);
 153 13b2bc37 2022-10-23 stsp 	free(abspath);
 154 13b2bc37 2022-10-23 stsp 	free(canonpath);
 155 13b2bc37 2022-10-23 stsp 	if (err) {
 156 13b2bc37 2022-10-23 stsp 		free(*repo_path);
 157 13b2bc37 2022-10-23 stsp 		*repo_path = NULL;
 158 13b2bc37 2022-10-23 stsp 	}
 159 13b2bc37 2022-10-23 stsp 	return err;
 160 13b2bc37 2022-10-23 stsp }
 161 13b2bc37 2022-10-23 stsp 
 162 13b2bc37 2022-10-23 stsp static const struct got_error *
 163 13b2bc37 2022-10-23 stsp append_read_capabilities(size_t *capalen, size_t len, const char *symrefstr,
 164 13b2bc37 2022-10-23 stsp     uint8_t *buf, size_t bufsize)
 165 13b2bc37 2022-10-23 stsp {
 166 13b2bc37 2022-10-23 stsp 	struct got_capability capa[nitems(read_capabilities) + 1];
 167 13b2bc37 2022-10-23 stsp 	size_t ncapa;
 168 13b2bc37 2022-10-23 stsp 
 169 13b2bc37 2022-10-23 stsp 	memcpy(&capa, read_capabilities, sizeof(read_capabilities));
 170 13b2bc37 2022-10-23 stsp 	if (symrefstr) {
 171 13b2bc37 2022-10-23 stsp 		capa[nitems(read_capabilities)].key = "symref";
 172 13b2bc37 2022-10-23 stsp 		capa[nitems(read_capabilities)].value = symrefstr;
 173 13b2bc37 2022-10-23 stsp 		ncapa = nitems(capa);
 174 13b2bc37 2022-10-23 stsp 	} else
 175 13b2bc37 2022-10-23 stsp 		ncapa = nitems(read_capabilities);
 176 13b2bc37 2022-10-23 stsp 
 177 13b2bc37 2022-10-23 stsp 	return got_gitproto_append_capabilities(capalen, buf, len,
 178 13b2bc37 2022-10-23 stsp 	    bufsize, capa, ncapa);
 179 13b2bc37 2022-10-23 stsp }
 180 13b2bc37 2022-10-23 stsp 
 181 13b2bc37 2022-10-23 stsp static const struct got_error *
 182 13b2bc37 2022-10-23 stsp send_ref(int outfd, uint8_t *id, const char *refname, int send_capabilities,
 183 13b2bc37 2022-10-23 stsp     int client_is_reading, const char *symrefstr, int chattygot)
 184 13b2bc37 2022-10-23 stsp {
 185 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 186 13b2bc37 2022-10-23 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
 187 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 188 13b2bc37 2022-10-23 stsp 	size_t len, capalen = 0;
 189 13b2bc37 2022-10-23 stsp 
 190 758dc042 2022-11-06 stsp 	if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
 191 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 192 13b2bc37 2022-10-23 stsp 
 193 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "%s %s", hex, refname);
 194 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 195 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 196 13b2bc37 2022-10-23 stsp 
 197 13b2bc37 2022-10-23 stsp 	if (send_capabilities) {
 198 13b2bc37 2022-10-23 stsp 		if (client_is_reading) {
 199 13b2bc37 2022-10-23 stsp 			err = append_read_capabilities(&capalen, len,
 200 13b2bc37 2022-10-23 stsp 			    symrefstr, buf, sizeof(buf));
 201 13b2bc37 2022-10-23 stsp 		} else {
 202 13b2bc37 2022-10-23 stsp 			err = got_gitproto_append_capabilities(&capalen,
 203 13b2bc37 2022-10-23 stsp 			    buf, len, sizeof(buf), write_capabilities,
 204 13b2bc37 2022-10-23 stsp 			    nitems(write_capabilities));
 205 13b2bc37 2022-10-23 stsp 		}
 206 13b2bc37 2022-10-23 stsp 		if (err)
 207 13b2bc37 2022-10-23 stsp 			return err;
 208 13b2bc37 2022-10-23 stsp 		len += capalen;
 209 13b2bc37 2022-10-23 stsp 	}
 210 13b2bc37 2022-10-23 stsp 
 211 13b2bc37 2022-10-23 stsp 	if (len + 1 >= sizeof(buf))
 212 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 213 13b2bc37 2022-10-23 stsp 	buf[len] = '\n';
 214 13b2bc37 2022-10-23 stsp 	len++;
 215 13b2bc37 2022-10-23 stsp 	buf[len] = '\0';
 216 13b2bc37 2022-10-23 stsp 
 217 13b2bc37 2022-10-23 stsp 	return got_pkt_writepkt(outfd, buf, len, chattygot);
 218 13b2bc37 2022-10-23 stsp }
 219 13b2bc37 2022-10-23 stsp 
 220 13b2bc37 2022-10-23 stsp static const struct got_error *
 221 2ff9f081 2022-11-08 stsp send_zero_refs(int outfd, int client_is_reading, int chattygot)
 222 13b2bc37 2022-10-23 stsp {
 223 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 224 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 225 13b2bc37 2022-10-23 stsp 	uint8_t zero[SHA1_DIGEST_LENGTH];
 226 13b2bc37 2022-10-23 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
 227 13b2bc37 2022-10-23 stsp 	size_t len, capalen = 0;
 228 13b2bc37 2022-10-23 stsp 
 229 13b2bc37 2022-10-23 stsp 	memset(&zero, 0, sizeof(zero));
 230 13b2bc37 2022-10-23 stsp 
 231 758dc042 2022-11-06 stsp 	if (got_sha1_digest_to_str(zero, hex, sizeof(hex)) == NULL)
 232 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 233 13b2bc37 2022-10-23 stsp 
 234 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "%s capabilities^{}", hex);
 235 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 236 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 237 13b2bc37 2022-10-23 stsp 
 238 2ff9f081 2022-11-08 stsp 	if (client_is_reading) {
 239 2ff9f081 2022-11-08 stsp 		err = got_gitproto_append_capabilities(&capalen, buf, len,
 240 2ff9f081 2022-11-08 stsp 		    sizeof(buf), read_capabilities, nitems(read_capabilities));
 241 2ff9f081 2022-11-08 stsp 		if (err)
 242 2ff9f081 2022-11-08 stsp 			return err;
 243 2ff9f081 2022-11-08 stsp 	} else {
 244 2ff9f081 2022-11-08 stsp 		err = got_gitproto_append_capabilities(&capalen, buf, len,
 245 2ff9f081 2022-11-08 stsp 		    sizeof(buf), write_capabilities,
 246 2ff9f081 2022-11-08 stsp 		    nitems(write_capabilities));
 247 2ff9f081 2022-11-08 stsp 		if (err)
 248 2ff9f081 2022-11-08 stsp 			return err;
 249 2ff9f081 2022-11-08 stsp 	}
 250 13b2bc37 2022-10-23 stsp 
 251 c6b5adb8 2022-11-07 stsp 	return got_pkt_writepkt(outfd, buf, len + capalen, chattygot);
 252 13b2bc37 2022-10-23 stsp }
 253 13b2bc37 2022-10-23 stsp 
 254 13b2bc37 2022-10-23 stsp static void
 255 13b2bc37 2022-10-23 stsp echo_error(const struct got_error *err, int outfd, int chattygot)
 256 13b2bc37 2022-10-23 stsp {
 257 13b2bc37 2022-10-23 stsp 	char buf[4 + GOT_ERR_MAX_MSG_SIZE];
 258 13b2bc37 2022-10-23 stsp 	size_t len;
 259 13b2bc37 2022-10-23 stsp 
 260 13b2bc37 2022-10-23 stsp 	/*
 261 13b2bc37 2022-10-23 stsp 	 * Echo the error to the client on a pkt-line.
 262 13b2bc37 2022-10-23 stsp 	 * The client should then terminate its session.
 263 13b2bc37 2022-10-23 stsp 	 */
 264 13b2bc37 2022-10-23 stsp 	buf[0] = 'E'; buf[1] = 'R'; buf[2] = 'R'; buf[3] = ' '; buf[4] = '\0';
 265 13b2bc37 2022-10-23 stsp 	len = strlcat(buf, err->msg, sizeof(buf));
 266 d10629e6 2022-12-08 stsp 	got_pkt_writepkt(outfd, buf, len, chattygot);
 267 13b2bc37 2022-10-23 stsp }
 268 13b2bc37 2022-10-23 stsp 
 269 13b2bc37 2022-10-23 stsp static const struct got_error *
 270 13b2bc37 2022-10-23 stsp announce_refs(int outfd, struct imsgbuf *ibuf, int client_is_reading,
 271 13b2bc37 2022-10-23 stsp     const char *repo_path, int chattygot)
 272 13b2bc37 2022-10-23 stsp {
 273 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 274 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 275 13b2bc37 2022-10-23 stsp 	size_t datalen;
 276 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_list_refs lsref;
 277 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_reflist ireflist;
 278 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref iref;
 279 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_symref isymref;
 280 13b2bc37 2022-10-23 stsp 	size_t nrefs = 0;
 281 13b2bc37 2022-10-23 stsp 	int have_nrefs = 0, sent_capabilities = 0;
 282 13b2bc37 2022-10-23 stsp 	char *symrefname = NULL, *symreftarget = NULL, *symrefstr = NULL;
 283 13b2bc37 2022-10-23 stsp 	char *refname = NULL;
 284 13b2bc37 2022-10-23 stsp 
 285 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 286 13b2bc37 2022-10-23 stsp 	memset(&lsref, 0, sizeof(lsref));
 287 13b2bc37 2022-10-23 stsp 
 288 13b2bc37 2022-10-23 stsp 	if (strlcpy(lsref.repo_name, repo_path, sizeof(lsref.repo_name)) >=
 289 13b2bc37 2022-10-23 stsp 	    sizeof(lsref.repo_name))
 290 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 291 13b2bc37 2022-10-23 stsp 	lsref.client_is_reading = client_is_reading;
 292 a2c12f7b 2023-01-27 op 
 293 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_LIST_REFS, 0, 0, -1,
 294 13b2bc37 2022-10-23 stsp 	    &lsref, sizeof(lsref)) == -1)
 295 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose LIST_REFS");
 296 13b2bc37 2022-10-23 stsp 
 297 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 298 13b2bc37 2022-10-23 stsp 	if (err)
 299 13b2bc37 2022-10-23 stsp 		return err;
 300 13b2bc37 2022-10-23 stsp 
 301 13b2bc37 2022-10-23 stsp 	while (!have_nrefs || nrefs > 0) {
 302 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 303 13b2bc37 2022-10-23 stsp 		if (err)
 304 13b2bc37 2022-10-23 stsp 			goto done;
 305 13b2bc37 2022-10-23 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
 306 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 307 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 308 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 309 13b2bc37 2022-10-23 stsp 			goto done;
 310 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REFLIST:
 311 13b2bc37 2022-10-23 stsp 			if (have_nrefs || nrefs > 0) {
 312 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 313 13b2bc37 2022-10-23 stsp 				goto done;
 314 13b2bc37 2022-10-23 stsp 			}
 315 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(ireflist)) {
 316 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 317 13b2bc37 2022-10-23 stsp 				goto done;
 318 13b2bc37 2022-10-23 stsp 			}
 319 13b2bc37 2022-10-23 stsp 			memcpy(&ireflist, imsg.data, sizeof(ireflist));
 320 13b2bc37 2022-10-23 stsp 			nrefs = ireflist.nrefs;
 321 13b2bc37 2022-10-23 stsp 			have_nrefs = 1;
 322 13b2bc37 2022-10-23 stsp 			if (nrefs == 0)
 323 2ff9f081 2022-11-08 stsp 				err = send_zero_refs(outfd, client_is_reading,
 324 2ff9f081 2022-11-08 stsp 				    chattygot);
 325 13b2bc37 2022-10-23 stsp 			break;
 326 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REF:
 327 13b2bc37 2022-10-23 stsp 			if (!have_nrefs || nrefs == 0) {
 328 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 329 13b2bc37 2022-10-23 stsp 				goto done;
 330 13b2bc37 2022-10-23 stsp 			}
 331 13b2bc37 2022-10-23 stsp 			if (datalen < sizeof(iref)) {
 332 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 333 13b2bc37 2022-10-23 stsp 				goto done;
 334 13b2bc37 2022-10-23 stsp 			}
 335 13b2bc37 2022-10-23 stsp 			memcpy(&iref, imsg.data, sizeof(iref));
 336 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(iref) + iref.name_len) {
 337 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 338 13b2bc37 2022-10-23 stsp 				goto done;
 339 13b2bc37 2022-10-23 stsp 			}
 340 00b3e9ae 2023-01-11 op 			refname = strndup(imsg.data + sizeof(iref),
 341 00b3e9ae 2023-01-11 op 			    iref.name_len);
 342 13b2bc37 2022-10-23 stsp 			if (refname == NULL) {
 343 00b3e9ae 2023-01-11 op 				err = got_error_from_errno("strndup");
 344 13b2bc37 2022-10-23 stsp 				goto done;
 345 13b2bc37 2022-10-23 stsp 			}
 346 13b2bc37 2022-10-23 stsp 			err = send_ref(outfd, iref.id, refname,
 347 13b2bc37 2022-10-23 stsp 			    !sent_capabilities, client_is_reading,
 348 13b2bc37 2022-10-23 stsp 			    NULL, chattygot);
 349 13b2bc37 2022-10-23 stsp 			free(refname);
 350 13b2bc37 2022-10-23 stsp 			refname = NULL;
 351 13b2bc37 2022-10-23 stsp 			if (err)
 352 13b2bc37 2022-10-23 stsp 				goto done;
 353 13b2bc37 2022-10-23 stsp 			sent_capabilities = 1;
 354 13b2bc37 2022-10-23 stsp 			if (nrefs > 0)
 355 13b2bc37 2022-10-23 stsp 				nrefs--;
 356 13b2bc37 2022-10-23 stsp 			break;
 357 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_SYMREF:
 358 13b2bc37 2022-10-23 stsp 			if (!have_nrefs || nrefs == 0) {
 359 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 360 13b2bc37 2022-10-23 stsp 				goto done;
 361 13b2bc37 2022-10-23 stsp 			}
 362 13b2bc37 2022-10-23 stsp 			if (datalen < sizeof(isymref)) {
 363 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 364 13b2bc37 2022-10-23 stsp 				goto done;
 365 13b2bc37 2022-10-23 stsp 			}
 366 13b2bc37 2022-10-23 stsp 			memcpy(&isymref, imsg.data, sizeof(isymref));
 367 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(isymref) + isymref.name_len +
 368 13b2bc37 2022-10-23 stsp 			    isymref.target_len) {
 369 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 370 13b2bc37 2022-10-23 stsp 				goto done;
 371 13b2bc37 2022-10-23 stsp 			}
 372 13b2bc37 2022-10-23 stsp 
 373 13b2bc37 2022-10-23 stsp 			/*
 374 13b2bc37 2022-10-23 stsp 			 * For now, we only announce one symbolic ref,
 375 13b2bc37 2022-10-23 stsp 			 * as part of our capability advertisement.
 376 13b2bc37 2022-10-23 stsp 			 */
 377 13b2bc37 2022-10-23 stsp 			if (sent_capabilities || symrefstr != NULL ||
 378 13b2bc37 2022-10-23 stsp 			    symrefname != NULL || symreftarget != NULL)
 379 13b2bc37 2022-10-23 stsp 				break;
 380 13b2bc37 2022-10-23 stsp 
 381 00b3e9ae 2023-01-11 op 			symrefname = strndup(imsg.data + sizeof(isymref),
 382 00b3e9ae 2023-01-11 op 			    isymref.name_len);
 383 13b2bc37 2022-10-23 stsp 			if (symrefname == NULL) {
 384 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("malloc");
 385 13b2bc37 2022-10-23 stsp 				goto done;
 386 13b2bc37 2022-10-23 stsp 			}
 387 13b2bc37 2022-10-23 stsp 
 388 00b3e9ae 2023-01-11 op 			symreftarget = strndup(
 389 00b3e9ae 2023-01-11 op 			    imsg.data + sizeof(isymref) + isymref.name_len,
 390 00b3e9ae 2023-01-11 op 			    isymref.target_len);
 391 13b2bc37 2022-10-23 stsp 			if (symreftarget == NULL) {
 392 00b3e9ae 2023-01-11 op 				err = got_error_from_errno("strndup");
 393 13b2bc37 2022-10-23 stsp 				goto done;
 394 13b2bc37 2022-10-23 stsp 			}
 395 13b2bc37 2022-10-23 stsp 
 396 13b2bc37 2022-10-23 stsp 			if (asprintf(&symrefstr, "%s:%s", symrefname,
 397 13b2bc37 2022-10-23 stsp 			    symreftarget) == -1) {
 398 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("asprintf");
 399 13b2bc37 2022-10-23 stsp 				goto done;
 400 13b2bc37 2022-10-23 stsp 			}
 401 13b2bc37 2022-10-23 stsp 			err = send_ref(outfd, isymref.target_id, symrefname,
 402 13b2bc37 2022-10-23 stsp 			    !sent_capabilities, client_is_reading, symrefstr,
 403 13b2bc37 2022-10-23 stsp 			    chattygot);
 404 13b2bc37 2022-10-23 stsp 			free(refname);
 405 13b2bc37 2022-10-23 stsp 			refname = NULL;
 406 13b2bc37 2022-10-23 stsp 			if (err)
 407 13b2bc37 2022-10-23 stsp 				goto done;
 408 13b2bc37 2022-10-23 stsp 			sent_capabilities = 1;
 409 13b2bc37 2022-10-23 stsp 			if (nrefs > 0)
 410 13b2bc37 2022-10-23 stsp 				nrefs--;
 411 13b2bc37 2022-10-23 stsp 			break;
 412 13b2bc37 2022-10-23 stsp 		default:
 413 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 414 13b2bc37 2022-10-23 stsp 			break;
 415 13b2bc37 2022-10-23 stsp 		}
 416 13b2bc37 2022-10-23 stsp 
 417 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 418 13b2bc37 2022-10-23 stsp 	}
 419 13b2bc37 2022-10-23 stsp 
 420 13b2bc37 2022-10-23 stsp 	err = got_pkt_flushpkt(outfd, chattygot);
 421 13b2bc37 2022-10-23 stsp 	if (err)
 422 13b2bc37 2022-10-23 stsp 		goto done;
 423 13b2bc37 2022-10-23 stsp done:
 424 13b2bc37 2022-10-23 stsp 	free(symrefstr);
 425 13b2bc37 2022-10-23 stsp 	free(symrefname);
 426 13b2bc37 2022-10-23 stsp 	free(symreftarget);
 427 13b2bc37 2022-10-23 stsp 	return err;
 428 13b2bc37 2022-10-23 stsp }
 429 13b2bc37 2022-10-23 stsp 
 430 13b2bc37 2022-10-23 stsp static const struct got_error *
 431 13b2bc37 2022-10-23 stsp parse_want_line(char **common_capabilities, uint8_t *id, char *buf, size_t len)
 432 13b2bc37 2022-10-23 stsp {
 433 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 434 13b2bc37 2022-10-23 stsp 	char *id_str = NULL, *client_capabilities = NULL;
 435 13b2bc37 2022-10-23 stsp 
 436 13b2bc37 2022-10-23 stsp 	err = got_gitproto_parse_want_line(&id_str,
 437 13b2bc37 2022-10-23 stsp 	    &client_capabilities, buf, len);
 438 13b2bc37 2022-10-23 stsp 	if (err)
 439 13b2bc37 2022-10-23 stsp 		return err;
 440 13b2bc37 2022-10-23 stsp 
 441 13b2bc37 2022-10-23 stsp 	if (!got_parse_sha1_digest(id, id_str)) {
 442 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
 443 13b2bc37 2022-10-23 stsp 		    "want-line with bad object ID");
 444 13b2bc37 2022-10-23 stsp 		goto done;
 445 13b2bc37 2022-10-23 stsp 	}
 446 13b2bc37 2022-10-23 stsp 
 447 13b2bc37 2022-10-23 stsp 	if (client_capabilities) {
 448 13b2bc37 2022-10-23 stsp 		err = got_gitproto_match_capabilities(common_capabilities,
 449 13b2bc37 2022-10-23 stsp 		    NULL, client_capabilities, read_capabilities,
 450 13b2bc37 2022-10-23 stsp 		    nitems(read_capabilities));
 451 13b2bc37 2022-10-23 stsp 		if (err)
 452 13b2bc37 2022-10-23 stsp 			goto done;
 453 13b2bc37 2022-10-23 stsp 	}
 454 13b2bc37 2022-10-23 stsp done:
 455 13b2bc37 2022-10-23 stsp 	free(id_str);
 456 13b2bc37 2022-10-23 stsp 	free(client_capabilities);
 457 13b2bc37 2022-10-23 stsp 	return err;
 458 13b2bc37 2022-10-23 stsp }
 459 13b2bc37 2022-10-23 stsp 
 460 13b2bc37 2022-10-23 stsp static const struct got_error *
 461 13b2bc37 2022-10-23 stsp parse_have_line(uint8_t *id, char *buf, size_t len)
 462 13b2bc37 2022-10-23 stsp {
 463 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 464 13b2bc37 2022-10-23 stsp 	char *id_str = NULL;
 465 13b2bc37 2022-10-23 stsp 
 466 13b2bc37 2022-10-23 stsp 	err = got_gitproto_parse_have_line(&id_str, buf, len);
 467 13b2bc37 2022-10-23 stsp 	if (err)
 468 13b2bc37 2022-10-23 stsp 		return err;
 469 13b2bc37 2022-10-23 stsp 
 470 13b2bc37 2022-10-23 stsp 	if (!got_parse_sha1_digest(id, id_str)) {
 471 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
 472 13b2bc37 2022-10-23 stsp 		    "have-line with bad object ID");
 473 13b2bc37 2022-10-23 stsp 		goto done;
 474 13b2bc37 2022-10-23 stsp 	}
 475 13b2bc37 2022-10-23 stsp done:
 476 13b2bc37 2022-10-23 stsp 	free(id_str);
 477 13b2bc37 2022-10-23 stsp 	return err;
 478 13b2bc37 2022-10-23 stsp }
 479 13b2bc37 2022-10-23 stsp 
 480 13b2bc37 2022-10-23 stsp static const struct got_error *
 481 13b2bc37 2022-10-23 stsp send_capability(struct got_capability *capa, struct imsgbuf *ibuf)
 482 13b2bc37 2022-10-23 stsp {
 483 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 484 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_capability icapa;
 485 13b2bc37 2022-10-23 stsp 	size_t len;
 486 13b2bc37 2022-10-23 stsp 	struct ibuf *wbuf;
 487 13b2bc37 2022-10-23 stsp 
 488 13b2bc37 2022-10-23 stsp 	memset(&icapa, 0, sizeof(icapa));
 489 13b2bc37 2022-10-23 stsp 
 490 13b2bc37 2022-10-23 stsp 	icapa.key_len = strlen(capa->key);
 491 13b2bc37 2022-10-23 stsp 	len = sizeof(icapa) + icapa.key_len;
 492 13b2bc37 2022-10-23 stsp 	if (capa->value) {
 493 13b2bc37 2022-10-23 stsp 		icapa.value_len = strlen(capa->value);
 494 13b2bc37 2022-10-23 stsp 		len += icapa.value_len;
 495 13b2bc37 2022-10-23 stsp 	}
 496 13b2bc37 2022-10-23 stsp 
 497 13b2bc37 2022-10-23 stsp 	wbuf = imsg_create(ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
 498 13b2bc37 2022-10-23 stsp 	if (wbuf == NULL) {
 499 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_create CAPABILITY");
 500 13b2bc37 2022-10-23 stsp 		return err;
 501 13b2bc37 2022-10-23 stsp 	}
 502 13b2bc37 2022-10-23 stsp 
 503 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
 504 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add CAPABILITY");
 505 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
 506 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add CAPABILITY");
 507 13b2bc37 2022-10-23 stsp 	if (capa->value) {
 508 13b2bc37 2022-10-23 stsp 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
 509 13b2bc37 2022-10-23 stsp 			return got_error_from_errno("imsg_add CAPABILITY");
 510 13b2bc37 2022-10-23 stsp 	}
 511 13b2bc37 2022-10-23 stsp 
 512 13b2bc37 2022-10-23 stsp 	wbuf->fd = -1;
 513 13b2bc37 2022-10-23 stsp 	imsg_close(ibuf, wbuf);
 514 13b2bc37 2022-10-23 stsp 
 515 13b2bc37 2022-10-23 stsp 	return NULL;
 516 13b2bc37 2022-10-23 stsp }
 517 13b2bc37 2022-10-23 stsp 
 518 13b2bc37 2022-10-23 stsp static const struct got_error *
 519 13b2bc37 2022-10-23 stsp send_capabilities(int *use_sidebands, int *report_status,
 520 13b2bc37 2022-10-23 stsp     char *capabilities_str, struct imsgbuf *ibuf)
 521 13b2bc37 2022-10-23 stsp {
 522 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 523 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_capabilities icapas;
 524 13b2bc37 2022-10-23 stsp 	struct got_capability *capa = NULL;
 525 13b2bc37 2022-10-23 stsp 	size_t ncapa, i;
 526 13b2bc37 2022-10-23 stsp 
 527 13b2bc37 2022-10-23 stsp 	err = got_gitproto_split_capabilities_str(&capa, &ncapa,
 528 13b2bc37 2022-10-23 stsp 	    capabilities_str);
 529 13b2bc37 2022-10-23 stsp 	if (err)
 530 13b2bc37 2022-10-23 stsp 		return err;
 531 13b2bc37 2022-10-23 stsp 
 532 13b2bc37 2022-10-23 stsp 	icapas.ncapabilities = ncapa;
 533 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_CAPABILITIES, 0, 0, -1,
 534 13b2bc37 2022-10-23 stsp 	    &icapas, sizeof(icapas)) == -1) {
 535 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_compose IMSG_CAPABILITIES");
 536 13b2bc37 2022-10-23 stsp 		goto done;
 537 13b2bc37 2022-10-23 stsp 	}
 538 13b2bc37 2022-10-23 stsp 
 539 13b2bc37 2022-10-23 stsp 	for (i = 0; i < ncapa; i++) {
 540 13b2bc37 2022-10-23 stsp 		err = send_capability(&capa[i], ibuf);
 541 13b2bc37 2022-10-23 stsp 		if (err)
 542 13b2bc37 2022-10-23 stsp 			goto done;
 543 13b2bc37 2022-10-23 stsp 		if (use_sidebands &&
 544 13b2bc37 2022-10-23 stsp 		    strcmp(capa[i].key, GOT_CAPA_SIDE_BAND_64K) == 0)
 545 13b2bc37 2022-10-23 stsp 			*use_sidebands = 1;
 546 13b2bc37 2022-10-23 stsp 		if (report_status &&
 547 13b2bc37 2022-10-23 stsp 		    strcmp(capa[i].key, GOT_CAPA_REPORT_STATUS) == 0)
 548 13b2bc37 2022-10-23 stsp 			*report_status = 1;
 549 13b2bc37 2022-10-23 stsp 	}
 550 13b2bc37 2022-10-23 stsp done:
 551 13b2bc37 2022-10-23 stsp 	free(capa);
 552 13b2bc37 2022-10-23 stsp 	return err;
 553 13b2bc37 2022-10-23 stsp }
 554 13b2bc37 2022-10-23 stsp 
 555 13b2bc37 2022-10-23 stsp static const struct got_error *
 556 13b2bc37 2022-10-23 stsp forward_flushpkt(struct imsgbuf *ibuf)
 557 13b2bc37 2022-10-23 stsp {
 558 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_FLUSH, 0, 0, -1, NULL, 0) == -1)
 559 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose FLUSH");
 560 13b2bc37 2022-10-23 stsp 
 561 13b2bc37 2022-10-23 stsp 	return gotd_imsg_flush(ibuf);
 562 13b2bc37 2022-10-23 stsp }
 563 13b2bc37 2022-10-23 stsp 
 564 13b2bc37 2022-10-23 stsp static const struct got_error *
 565 13b2bc37 2022-10-23 stsp recv_ack(struct imsg *imsg, uint8_t *expected_id)
 566 13b2bc37 2022-10-23 stsp {
 567 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ack iack;
 568 13b2bc37 2022-10-23 stsp 	size_t datalen;
 569 13b2bc37 2022-10-23 stsp 
 570 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 571 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(iack))
 572 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 573 13b2bc37 2022-10-23 stsp 
 574 13b2bc37 2022-10-23 stsp 	memcpy(&iack, imsg->data, sizeof(iack));
 575 13b2bc37 2022-10-23 stsp 	if (memcmp(iack.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
 576 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 577 13b2bc37 2022-10-23 stsp 
 578 13b2bc37 2022-10-23 stsp 	return NULL;
 579 13b2bc37 2022-10-23 stsp }
 580 13b2bc37 2022-10-23 stsp 
 581 13b2bc37 2022-10-23 stsp static const struct got_error *
 582 13b2bc37 2022-10-23 stsp recv_nak(struct imsg *imsg, uint8_t *expected_id)
 583 13b2bc37 2022-10-23 stsp {
 584 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ack inak;
 585 13b2bc37 2022-10-23 stsp 	size_t datalen;
 586 13b2bc37 2022-10-23 stsp 
 587 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 588 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(inak))
 589 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 590 13b2bc37 2022-10-23 stsp 
 591 13b2bc37 2022-10-23 stsp 	memcpy(&inak, imsg->data, sizeof(inak));
 592 13b2bc37 2022-10-23 stsp 	if (memcmp(inak.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
 593 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 594 13b2bc37 2022-10-23 stsp 
 595 13b2bc37 2022-10-23 stsp 	return NULL;
 596 13b2bc37 2022-10-23 stsp }
 597 13b2bc37 2022-10-23 stsp 
 598 13b2bc37 2022-10-23 stsp 
 599 13b2bc37 2022-10-23 stsp static const struct got_error *
 600 13b2bc37 2022-10-23 stsp recv_want(int *use_sidebands, int outfd, struct imsgbuf *ibuf,
 601 13b2bc37 2022-10-23 stsp     char *buf, size_t len, int expect_capabilities, int chattygot)
 602 13b2bc37 2022-10-23 stsp {
 603 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 604 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_want iwant;
 605 13b2bc37 2022-10-23 stsp 	char *capabilities_str;
 606 13b2bc37 2022-10-23 stsp 	int done = 0;
 607 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 608 13b2bc37 2022-10-23 stsp 
 609 13b2bc37 2022-10-23 stsp 	memset(&iwant, 0, sizeof(iwant));
 610 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 611 13b2bc37 2022-10-23 stsp 
 612 13b2bc37 2022-10-23 stsp 	err = parse_want_line(&capabilities_str, iwant.object_id, buf, len);
 613 13b2bc37 2022-10-23 stsp 	if (err)
 614 13b2bc37 2022-10-23 stsp 		return err;
 615 13b2bc37 2022-10-23 stsp 
 616 13b2bc37 2022-10-23 stsp 	if (capabilities_str) {
 617 13b2bc37 2022-10-23 stsp 		if (!expect_capabilities) {
 618 13b2bc37 2022-10-23 stsp 			err = got_error_msg(GOT_ERR_BAD_PACKET,
 619 13b2bc37 2022-10-23 stsp 			    "unexpected capability announcement received");
 620 13b2bc37 2022-10-23 stsp 			goto done;
 621 13b2bc37 2022-10-23 stsp 		}
 622 13b2bc37 2022-10-23 stsp 		err = send_capabilities(use_sidebands, NULL, capabilities_str,
 623 13b2bc37 2022-10-23 stsp 		    ibuf);
 624 13b2bc37 2022-10-23 stsp 		if (err)
 625 13b2bc37 2022-10-23 stsp 			goto done;
 626 13b2bc37 2022-10-23 stsp 
 627 13b2bc37 2022-10-23 stsp 	}
 628 13b2bc37 2022-10-23 stsp 
 629 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_WANT, 0, 0, -1,
 630 13b2bc37 2022-10-23 stsp 	    &iwant, sizeof(iwant)) == -1) {
 631 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_compose WANT");
 632 13b2bc37 2022-10-23 stsp 		goto done;
 633 13b2bc37 2022-10-23 stsp 	}
 634 13b2bc37 2022-10-23 stsp 
 635 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 636 13b2bc37 2022-10-23 stsp 	if (err)
 637 13b2bc37 2022-10-23 stsp 		goto done;
 638 13b2bc37 2022-10-23 stsp 
 639 13b2bc37 2022-10-23 stsp 	/*
 640 13b2bc37 2022-10-23 stsp 	 * Wait for an ACK, or an error in case the desired object
 641 13b2bc37 2022-10-23 stsp 	 * does not exist.
 642 13b2bc37 2022-10-23 stsp 	 */
 643 13b2bc37 2022-10-23 stsp 	while (!done && err == NULL) {
 644 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 645 13b2bc37 2022-10-23 stsp 		if (err)
 646 13b2bc37 2022-10-23 stsp 			break;
 647 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 648 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 649 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 650 13b2bc37 2022-10-23 stsp 			break;
 651 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ACK:
 652 13b2bc37 2022-10-23 stsp 			err = recv_ack(&imsg, iwant.object_id);
 653 13b2bc37 2022-10-23 stsp 			if (err)
 654 13b2bc37 2022-10-23 stsp 				break;
 655 13b2bc37 2022-10-23 stsp 			done = 1;
 656 13b2bc37 2022-10-23 stsp 			break;
 657 13b2bc37 2022-10-23 stsp 		default:
 658 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 659 13b2bc37 2022-10-23 stsp 			break;
 660 13b2bc37 2022-10-23 stsp 		}
 661 13b2bc37 2022-10-23 stsp 
 662 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 663 13b2bc37 2022-10-23 stsp 	}
 664 13b2bc37 2022-10-23 stsp done:
 665 13b2bc37 2022-10-23 stsp 	free(capabilities_str);
 666 13b2bc37 2022-10-23 stsp 	return err;
 667 13b2bc37 2022-10-23 stsp }
 668 13b2bc37 2022-10-23 stsp 
 669 13b2bc37 2022-10-23 stsp static const struct got_error *
 670 13b2bc37 2022-10-23 stsp send_ack(int outfd, uint8_t *id, int chattygot)
 671 13b2bc37 2022-10-23 stsp {
 672 13b2bc37 2022-10-23 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
 673 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 674 13b2bc37 2022-10-23 stsp 	int len;
 675 13b2bc37 2022-10-23 stsp 
 676 758dc042 2022-11-06 stsp 	if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
 677 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 678 13b2bc37 2022-10-23 stsp 
 679 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "ACK %s\n", hex);
 680 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 681 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 682 13b2bc37 2022-10-23 stsp 
 683 13b2bc37 2022-10-23 stsp 	return got_pkt_writepkt(outfd, buf, len, chattygot);
 684 13b2bc37 2022-10-23 stsp }
 685 13b2bc37 2022-10-23 stsp 
 686 13b2bc37 2022-10-23 stsp static const struct got_error *
 687 13b2bc37 2022-10-23 stsp send_nak(int outfd, int chattygot)
 688 13b2bc37 2022-10-23 stsp {
 689 13b2bc37 2022-10-23 stsp 	char buf[5];
 690 13b2bc37 2022-10-23 stsp 	int len;
 691 13b2bc37 2022-10-23 stsp 
 692 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "NAK\n");
 693 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 694 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 695 13b2bc37 2022-10-23 stsp 
 696 13b2bc37 2022-10-23 stsp 	return got_pkt_writepkt(outfd, buf, len, chattygot);
 697 13b2bc37 2022-10-23 stsp }
 698 13b2bc37 2022-10-23 stsp 
 699 13b2bc37 2022-10-23 stsp static const struct got_error *
 700 13b2bc37 2022-10-23 stsp recv_have(int *have_ack, int outfd, struct imsgbuf *ibuf, char *buf,
 701 13b2bc37 2022-10-23 stsp     size_t len, int chattygot)
 702 13b2bc37 2022-10-23 stsp {
 703 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 704 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_have ihave;
 705 13b2bc37 2022-10-23 stsp 	int done = 0;
 706 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 707 13b2bc37 2022-10-23 stsp 
 708 13b2bc37 2022-10-23 stsp 	memset(&ihave, 0, sizeof(ihave));
 709 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 710 13b2bc37 2022-10-23 stsp 
 711 13b2bc37 2022-10-23 stsp 	err = parse_have_line(ihave.object_id, buf, len);
 712 13b2bc37 2022-10-23 stsp 	if (err)
 713 13b2bc37 2022-10-23 stsp 		return err;
 714 13b2bc37 2022-10-23 stsp 
 715 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_HAVE, 0, 0, -1,
 716 13b2bc37 2022-10-23 stsp 	    &ihave, sizeof(ihave)) == -1)
 717 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose HAVE");
 718 13b2bc37 2022-10-23 stsp 
 719 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 720 13b2bc37 2022-10-23 stsp 	if (err)
 721 13b2bc37 2022-10-23 stsp 		return err;
 722 13b2bc37 2022-10-23 stsp 
 723 13b2bc37 2022-10-23 stsp 	/*
 724 13b2bc37 2022-10-23 stsp 	 * Wait for an ACK or a NAK, indicating whether a common
 725 13b2bc37 2022-10-23 stsp 	 * commit object has been found.
 726 13b2bc37 2022-10-23 stsp 	 */
 727 13b2bc37 2022-10-23 stsp 	while (!done && err == NULL) {
 728 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 729 13b2bc37 2022-10-23 stsp 		if (err)
 730 13b2bc37 2022-10-23 stsp 			return err;
 731 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 732 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 733 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 734 13b2bc37 2022-10-23 stsp 			break;
 735 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ACK:
 736 13b2bc37 2022-10-23 stsp 			err = recv_ack(&imsg, ihave.object_id);
 737 13b2bc37 2022-10-23 stsp 			if (err)
 738 13b2bc37 2022-10-23 stsp 				break;
 739 13b2bc37 2022-10-23 stsp 			if (!*have_ack) {
 740 13b2bc37 2022-10-23 stsp 				err = send_ack(outfd, ihave.object_id,
 741 13b2bc37 2022-10-23 stsp 				    chattygot);
 742 13b2bc37 2022-10-23 stsp 				if (err)
 743 13b2bc37 2022-10-23 stsp 					return err;
 744 13b2bc37 2022-10-23 stsp 				*have_ack = 1;
 745 13b2bc37 2022-10-23 stsp 			}
 746 13b2bc37 2022-10-23 stsp 			done = 1;
 747 13b2bc37 2022-10-23 stsp 			break;
 748 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_NAK:
 749 13b2bc37 2022-10-23 stsp 			err = recv_nak(&imsg, ihave.object_id);
 750 13b2bc37 2022-10-23 stsp 			if (err)
 751 13b2bc37 2022-10-23 stsp 				break;
 752 13b2bc37 2022-10-23 stsp 			done = 1;
 753 13b2bc37 2022-10-23 stsp 			break;
 754 13b2bc37 2022-10-23 stsp 		default:
 755 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 756 13b2bc37 2022-10-23 stsp 			break;
 757 13b2bc37 2022-10-23 stsp 		}
 758 13b2bc37 2022-10-23 stsp 
 759 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 760 13b2bc37 2022-10-23 stsp 	}
 761 13b2bc37 2022-10-23 stsp 
 762 13b2bc37 2022-10-23 stsp 	return err;
 763 13b2bc37 2022-10-23 stsp }
 764 13b2bc37 2022-10-23 stsp 
 765 13b2bc37 2022-10-23 stsp static const struct got_error *
 766 13b2bc37 2022-10-23 stsp recv_done(int *packfd, int outfd, struct imsgbuf *ibuf, int chattygot)
 767 13b2bc37 2022-10-23 stsp {
 768 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 769 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 770 13b2bc37 2022-10-23 stsp 
 771 13b2bc37 2022-10-23 stsp 	*packfd = -1;
 772 13b2bc37 2022-10-23 stsp 
 773 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_DONE, 0, 0, -1, NULL, 0) == -1)
 774 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose DONE");
 775 13b2bc37 2022-10-23 stsp 
 776 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 777 13b2bc37 2022-10-23 stsp 	if (err)
 778 13b2bc37 2022-10-23 stsp 		return err;
 779 13b2bc37 2022-10-23 stsp 
 780 86769de8 2022-10-28 stsp 	while (*packfd == -1 && err == NULL) {
 781 86769de8 2022-10-28 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 782 86769de8 2022-10-28 stsp 		if (err)
 783 86769de8 2022-10-28 stsp 			break;
 784 13b2bc37 2022-10-23 stsp 
 785 86769de8 2022-10-28 stsp 		switch (imsg.hdr.type) {
 786 86769de8 2022-10-28 stsp 		case GOTD_IMSG_ERROR:
 787 86769de8 2022-10-28 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 788 86769de8 2022-10-28 stsp 			break;
 789 86769de8 2022-10-28 stsp 		case GOTD_IMSG_PACKFILE_PIPE:
 790 86769de8 2022-10-28 stsp 			if (imsg.fd != -1)
 791 86769de8 2022-10-28 stsp 				*packfd = imsg.fd;
 792 86769de8 2022-10-28 stsp 			else
 793 86769de8 2022-10-28 stsp 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
 794 86769de8 2022-10-28 stsp 			break;
 795 86769de8 2022-10-28 stsp 		default:
 796 86769de8 2022-10-28 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 797 86769de8 2022-10-28 stsp 			break;
 798 86769de8 2022-10-28 stsp 		}
 799 13b2bc37 2022-10-23 stsp 
 800 86769de8 2022-10-28 stsp 		imsg_free(&imsg);
 801 86769de8 2022-10-28 stsp 	}
 802 86769de8 2022-10-28 stsp 
 803 13b2bc37 2022-10-23 stsp 	return err;
 804 13b2bc37 2022-10-23 stsp }
 805 13b2bc37 2022-10-23 stsp 
 806 13b2bc37 2022-10-23 stsp static const struct got_error *
 807 13b2bc37 2022-10-23 stsp relay_progress_reports(struct imsgbuf *ibuf, int outfd, int chattygot)
 808 13b2bc37 2022-10-23 stsp {
 809 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 810 13b2bc37 2022-10-23 stsp 	int pack_starting = 0;
 811 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_packfile_progress iprog;
 812 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 813 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 814 13b2bc37 2022-10-23 stsp 	size_t datalen;
 815 13b2bc37 2022-10-23 stsp 	int p_deltify = 0, n;
 816 13b2bc37 2022-10-23 stsp 	const char *eol = "\r";
 817 13b2bc37 2022-10-23 stsp 
 818 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 819 13b2bc37 2022-10-23 stsp 
 820 13b2bc37 2022-10-23 stsp 	while (!pack_starting && err == NULL) {
 821 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 822 13b2bc37 2022-10-23 stsp 		if (err)
 823 13b2bc37 2022-10-23 stsp 			break;
 824 13b2bc37 2022-10-23 stsp 
 825 13b2bc37 2022-10-23 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
 826 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 827 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 828 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 829 13b2bc37 2022-10-23 stsp 			break;
 830 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_PACKFILE_READY:
 831 13b2bc37 2022-10-23 stsp 			eol = "\n";
 832 13b2bc37 2022-10-23 stsp 			pack_starting = 1;
 833 13b2bc37 2022-10-23 stsp 			/* fallthrough */
 834 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_PACKFILE_PROGRESS:
 835 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(iprog)) {
 836 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 837 13b2bc37 2022-10-23 stsp 				break;
 838 13b2bc37 2022-10-23 stsp 			}
 839 13b2bc37 2022-10-23 stsp 			memcpy(&iprog, imsg.data, sizeof(iprog));
 840 13b2bc37 2022-10-23 stsp 			if (iprog.nobj_total > 0) {
 841 13b2bc37 2022-10-23 stsp 				p_deltify = (iprog.nobj_deltify * 100) /
 842 13b2bc37 2022-10-23 stsp 				    iprog.nobj_total;
 843 13b2bc37 2022-10-23 stsp 			}
 844 13b2bc37 2022-10-23 stsp 			buf[0] = GOT_SIDEBAND_PROGRESS_INFO;
 845 13b2bc37 2022-10-23 stsp 			n = snprintf(&buf[1], sizeof(buf) - 1,
 846 13b2bc37 2022-10-23 stsp 			    "%d commits colored, "
 847 13b2bc37 2022-10-23 stsp 			    "%d objects found, "
 848 13b2bc37 2022-10-23 stsp 			    "deltify %d%%%s",
 849 758dc042 2022-11-06 stsp 			    iprog.ncolored,
 850 758dc042 2022-11-06 stsp 			    iprog.nfound,
 851 13b2bc37 2022-10-23 stsp 			    p_deltify, eol);
 852 13b2bc37 2022-10-23 stsp 			if (n >= sizeof(buf) - 1)
 853 13b2bc37 2022-10-23 stsp 				break;
 854 13b2bc37 2022-10-23 stsp 			err = got_pkt_writepkt(outfd, buf, 1 + n, chattygot);
 855 13b2bc37 2022-10-23 stsp 			break;
 856 13b2bc37 2022-10-23 stsp 		default:
 857 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 858 13b2bc37 2022-10-23 stsp 			break;
 859 13b2bc37 2022-10-23 stsp 		}
 860 13b2bc37 2022-10-23 stsp 
 861 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 862 13b2bc37 2022-10-23 stsp 	}
 863 13b2bc37 2022-10-23 stsp 
 864 13b2bc37 2022-10-23 stsp 	return err;
 865 13b2bc37 2022-10-23 stsp }
 866 13b2bc37 2022-10-23 stsp 
 867 13b2bc37 2022-10-23 stsp static const struct got_error *
 868 13b2bc37 2022-10-23 stsp serve_read(int infd, int outfd, int gotd_sock, const char *repo_path,
 869 13b2bc37 2022-10-23 stsp     int chattygot)
 870 13b2bc37 2022-10-23 stsp {
 871 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 872 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 873 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
 874 13b2bc37 2022-10-23 stsp 	enum protostate {
 875 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_WANT,
 876 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_MORE_WANT,
 877 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_HAVE,
 878 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_DONE,
 879 13b2bc37 2022-10-23 stsp 		STATE_DONE,
 880 13b2bc37 2022-10-23 stsp 	};
 881 13b2bc37 2022-10-23 stsp 	enum protostate curstate = STATE_EXPECT_WANT;
 882 13b2bc37 2022-10-23 stsp 	int have_ack = 0, use_sidebands = 0, seen_have = 0;
 883 13b2bc37 2022-10-23 stsp 	int packfd = -1;
 884 13b2bc37 2022-10-23 stsp 	size_t pack_chunksize;
 885 13b2bc37 2022-10-23 stsp 
 886 13b2bc37 2022-10-23 stsp 	imsg_init(&ibuf, gotd_sock);
 887 13b2bc37 2022-10-23 stsp 
 888 13b2bc37 2022-10-23 stsp 	err = announce_refs(outfd, &ibuf, 1, repo_path, chattygot);
 889 13b2bc37 2022-10-23 stsp 	if (err)
 890 13b2bc37 2022-10-23 stsp 		goto done;
 891 13b2bc37 2022-10-23 stsp 
 892 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_DONE) {
 893 13b2bc37 2022-10-23 stsp 		int n;
 894 13b2bc37 2022-10-23 stsp 		buf[0] = '\0';
 895 13b2bc37 2022-10-23 stsp 		err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot);
 896 13b2bc37 2022-10-23 stsp 		if (err)
 897 96afb0d6 2023-01-21 stsp 			goto done;
 898 13b2bc37 2022-10-23 stsp 		if (n == 0) {
 899 fecfd5bc 2023-01-18 stsp 			if (curstate != STATE_EXPECT_WANT &&
 900 fecfd5bc 2023-01-18 stsp 			    curstate != STATE_EXPECT_MORE_WANT &&
 901 f9550d47 2023-01-18 stsp 			    curstate != STATE_EXPECT_HAVE &&
 902 f9550d47 2023-01-18 stsp 			    curstate != STATE_EXPECT_DONE) {
 903 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 904 13b2bc37 2022-10-23 stsp 				    "unexpected flush packet received");
 905 13b2bc37 2022-10-23 stsp 				goto done;
 906 13b2bc37 2022-10-23 stsp 			}
 907 fecfd5bc 2023-01-18 stsp 
 908 fecfd5bc 2023-01-18 stsp 			if (curstate == STATE_EXPECT_WANT) {
 909 fecfd5bc 2023-01-18 stsp 				ssize_t r;
 910 fecfd5bc 2023-01-18 stsp 				/*
 911 fecfd5bc 2023-01-18 stsp 				 * If the client does not want to fetch
 912 fecfd5bc 2023-01-18 stsp 				 * anything we should receive a flush
 913 fecfd5bc 2023-01-18 stsp 				 * packet followed by EOF.
 914 fecfd5bc 2023-01-18 stsp 				 */
 915 fecfd5bc 2023-01-18 stsp 				r = read(infd, buf, sizeof(buf));
 916 fecfd5bc 2023-01-18 stsp 				if (r == -1) {
 917 fecfd5bc 2023-01-18 stsp 					err = got_error_from_errno("read");
 918 fecfd5bc 2023-01-18 stsp 					goto done;
 919 fecfd5bc 2023-01-18 stsp 				}
 920 fecfd5bc 2023-01-18 stsp 				if (r == 0) /* EOF */
 921 fecfd5bc 2023-01-18 stsp 					goto done;
 922 fecfd5bc 2023-01-18 stsp 
 923 fecfd5bc 2023-01-18 stsp 				/* Zero-length field followed by payload. */
 924 fecfd5bc 2023-01-18 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 925 fecfd5bc 2023-01-18 stsp 				    "unexpected flush packet received");
 926 fecfd5bc 2023-01-18 stsp 				goto done;
 927 fecfd5bc 2023-01-18 stsp 			}
 928 fecfd5bc 2023-01-18 stsp 
 929 f91b5c43 2023-01-21 stsp 			if (curstate == STATE_EXPECT_WANT ||
 930 f91b5c43 2023-01-21 stsp 			    curstate == STATE_EXPECT_MORE_WANT ||
 931 f91b5c43 2023-01-21 stsp 			    curstate == STATE_EXPECT_HAVE) {
 932 f91b5c43 2023-01-21 stsp 				err = forward_flushpkt(&ibuf);
 933 f91b5c43 2023-01-21 stsp 				if (err)
 934 f91b5c43 2023-01-21 stsp 					goto done;
 935 f91b5c43 2023-01-21 stsp 			}
 936 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_HAVE && !have_ack) {
 937 13b2bc37 2022-10-23 stsp 				err = send_nak(outfd, chattygot);
 938 13b2bc37 2022-10-23 stsp 				if (err)
 939 13b2bc37 2022-10-23 stsp 					goto done;
 940 13b2bc37 2022-10-23 stsp 			}
 941 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_MORE_WANT)
 942 13b2bc37 2022-10-23 stsp 				curstate = STATE_EXPECT_HAVE;
 943 13b2bc37 2022-10-23 stsp 			else
 944 13b2bc37 2022-10-23 stsp 				curstate = STATE_EXPECT_DONE;
 945 13b2bc37 2022-10-23 stsp 		} else if (n >= 5 && strncmp(buf, "want ", 5) == 0) {
 946 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_WANT &&
 947 13b2bc37 2022-10-23 stsp 			    curstate != STATE_EXPECT_MORE_WANT) {
 948 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 949 13b2bc37 2022-10-23 stsp 				    "unexpected 'want' packet");
 950 13b2bc37 2022-10-23 stsp 				goto done;
 951 13b2bc37 2022-10-23 stsp 			}
 952 13b2bc37 2022-10-23 stsp 			err = recv_want(&use_sidebands, outfd, &ibuf, buf, n,
 953 13b2bc37 2022-10-23 stsp 			    curstate == STATE_EXPECT_WANT ? 1 : 0, chattygot);
 954 13b2bc37 2022-10-23 stsp 			if (err)
 955 13b2bc37 2022-10-23 stsp 				goto done;
 956 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_WANT)
 957 13b2bc37 2022-10-23 stsp 				curstate = STATE_EXPECT_MORE_WANT;
 958 13b2bc37 2022-10-23 stsp 		} else if (n >= 5 && strncmp(buf, "have ", 5) == 0) {
 959 f9550d47 2023-01-18 stsp 			if (curstate != STATE_EXPECT_HAVE &&
 960 f9550d47 2023-01-18 stsp 			    curstate != STATE_EXPECT_DONE) {
 961 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 962 13b2bc37 2022-10-23 stsp 				    "unexpected 'have' packet");
 963 13b2bc37 2022-10-23 stsp 				goto done;
 964 13b2bc37 2022-10-23 stsp 			}
 965 f9550d47 2023-01-18 stsp 			if (curstate == STATE_EXPECT_HAVE) {
 966 f9550d47 2023-01-18 stsp 				err = recv_have(&have_ack, outfd, &ibuf,
 967 f9550d47 2023-01-18 stsp 				    buf, n, chattygot);
 968 f9550d47 2023-01-18 stsp 				if (err)
 969 f9550d47 2023-01-18 stsp 					goto done;
 970 f9550d47 2023-01-18 stsp 				seen_have = 1;
 971 f9550d47 2023-01-18 stsp 				if (have_ack)
 972 f9550d47 2023-01-18 stsp 					curstate = STATE_EXPECT_DONE;
 973 f9550d47 2023-01-18 stsp 			}
 974 13b2bc37 2022-10-23 stsp 		} else if (n == 5 && strncmp(buf, "done\n", 5) == 0) {
 975 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_HAVE &&
 976 13b2bc37 2022-10-23 stsp 			    curstate != STATE_EXPECT_DONE) {
 977 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 978 13b2bc37 2022-10-23 stsp 				    "unexpected 'done' packet");
 979 13b2bc37 2022-10-23 stsp 				goto done;
 980 13b2bc37 2022-10-23 stsp 			}
 981 13b2bc37 2022-10-23 stsp 			err = recv_done(&packfd, outfd, &ibuf, chattygot);
 982 13b2bc37 2022-10-23 stsp 			if (err)
 983 13b2bc37 2022-10-23 stsp 				goto done;
 984 13b2bc37 2022-10-23 stsp 			curstate = STATE_DONE;
 985 13b2bc37 2022-10-23 stsp 			break;
 986 13b2bc37 2022-10-23 stsp 		} else {
 987 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_BAD_PACKET);
 988 13b2bc37 2022-10-23 stsp 			goto done;
 989 13b2bc37 2022-10-23 stsp 		}
 990 13b2bc37 2022-10-23 stsp 	}
 991 13b2bc37 2022-10-23 stsp 
 992 13b2bc37 2022-10-23 stsp 	if (!seen_have) {
 993 13b2bc37 2022-10-23 stsp 		err = send_nak(outfd, chattygot);
 994 13b2bc37 2022-10-23 stsp 		if (err)
 995 13b2bc37 2022-10-23 stsp 			goto done;
 996 13b2bc37 2022-10-23 stsp 	}
 997 13b2bc37 2022-10-23 stsp 
 998 13b2bc37 2022-10-23 stsp 	if (use_sidebands) {
 999 13b2bc37 2022-10-23 stsp 		err = relay_progress_reports(&ibuf, outfd, chattygot);
1000 13b2bc37 2022-10-23 stsp 		if (err)
1001 13b2bc37 2022-10-23 stsp 			goto done;
1002 13b2bc37 2022-10-23 stsp 		pack_chunksize = GOT_SIDEBAND_64K_PACKFILE_DATA_MAX;
1003 13b2bc37 2022-10-23 stsp 	} else
1004 13b2bc37 2022-10-23 stsp 		pack_chunksize = sizeof(buf);
1005 13b2bc37 2022-10-23 stsp 
1006 13b2bc37 2022-10-23 stsp 	for (;;) {
1007 1c9d898d 2022-10-31 stsp 		ssize_t r;
1008 13b2bc37 2022-10-23 stsp 
1009 13b2bc37 2022-10-23 stsp 		r = read(packfd, use_sidebands ? &buf[1] : buf,
1010 13b2bc37 2022-10-23 stsp 		    pack_chunksize);
1011 13b2bc37 2022-10-23 stsp 		if (r == -1) {
1012 13b2bc37 2022-10-23 stsp 			err = got_error_from_errno("read");
1013 13b2bc37 2022-10-23 stsp 			break;
1014 13b2bc37 2022-10-23 stsp 		} else if (r == 0) {
1015 13b2bc37 2022-10-23 stsp 			err = got_pkt_flushpkt(outfd, chattygot);
1016 13b2bc37 2022-10-23 stsp 			break;
1017 13b2bc37 2022-10-23 stsp 		}
1018 13b2bc37 2022-10-23 stsp 
1019 13b2bc37 2022-10-23 stsp 		if (use_sidebands) {
1020 13b2bc37 2022-10-23 stsp 			buf[0] = GOT_SIDEBAND_PACKFILE_DATA;
1021 13b2bc37 2022-10-23 stsp 			err = got_pkt_writepkt(outfd, buf, 1 + r, chattygot);
1022 13b2bc37 2022-10-23 stsp 			if (err)
1023 13b2bc37 2022-10-23 stsp 				break;
1024 13b2bc37 2022-10-23 stsp 		} else {
1025 1c9d898d 2022-10-31 stsp 			err = got_poll_write_full(outfd, buf, r);
1026 1c9d898d 2022-10-31 stsp 			if (err) {
1027 1c9d898d 2022-10-31 stsp 				if (err->code == GOT_ERR_EOF)
1028 1c9d898d 2022-10-31 stsp 					err = NULL;
1029 13b2bc37 2022-10-23 stsp 				break;
1030 13b2bc37 2022-10-23 stsp 			}
1031 13b2bc37 2022-10-23 stsp 		}
1032 13b2bc37 2022-10-23 stsp 	}
1033 13b2bc37 2022-10-23 stsp done:
1034 13b2bc37 2022-10-23 stsp 	imsg_clear(&ibuf);
1035 13b2bc37 2022-10-23 stsp 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
1036 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("close");
1037 13b2bc37 2022-10-23 stsp 	if (err)
1038 13b2bc37 2022-10-23 stsp 		echo_error(err, outfd, chattygot);
1039 13b2bc37 2022-10-23 stsp 	return err;
1040 13b2bc37 2022-10-23 stsp }
1041 13b2bc37 2022-10-23 stsp 
1042 13b2bc37 2022-10-23 stsp static const struct got_error *
1043 13b2bc37 2022-10-23 stsp parse_ref_update_line(char **common_capabilities, char **refname,
1044 13b2bc37 2022-10-23 stsp     uint8_t *old_id, uint8_t *new_id, char *buf, size_t len)
1045 13b2bc37 2022-10-23 stsp {
1046 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
1047 13b2bc37 2022-10-23 stsp 	char *old_id_str = NULL, *new_id_str = NULL;
1048 13b2bc37 2022-10-23 stsp 	char *client_capabilities = NULL;
1049 13b2bc37 2022-10-23 stsp 
1050 13b2bc37 2022-10-23 stsp 	*refname = NULL;
1051 13b2bc37 2022-10-23 stsp 
1052 13b2bc37 2022-10-23 stsp 	err = got_gitproto_parse_ref_update_line(&old_id_str, &new_id_str,
1053 13b2bc37 2022-10-23 stsp 	    refname, &client_capabilities, buf, len);
1054 13b2bc37 2022-10-23 stsp 	if (err)
1055 13b2bc37 2022-10-23 stsp 		return err;
1056 13b2bc37 2022-10-23 stsp 
1057 13b2bc37 2022-10-23 stsp 	if (!got_parse_sha1_digest(old_id, old_id_str) ||
1058 13b2bc37 2022-10-23 stsp 	    !got_parse_sha1_digest(new_id, new_id_str)) {
1059 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
1060 13b2bc37 2022-10-23 stsp 		    "ref-update with bad object ID");
1061 13b2bc37 2022-10-23 stsp 		goto done;
1062 13b2bc37 2022-10-23 stsp 	}
1063 13b2bc37 2022-10-23 stsp 	if (!got_ref_name_is_valid(*refname)) {
1064 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
1065 13b2bc37 2022-10-23 stsp 		    "ref-update with bad reference name");
1066 13b2bc37 2022-10-23 stsp 		goto done;
1067 13b2bc37 2022-10-23 stsp 	}
1068 13b2bc37 2022-10-23 stsp 
1069 13b2bc37 2022-10-23 stsp 	if (client_capabilities) {
1070 13b2bc37 2022-10-23 stsp 		err = got_gitproto_match_capabilities(common_capabilities,
1071 13b2bc37 2022-10-23 stsp 		    NULL, client_capabilities, write_capabilities,
1072 13b2bc37 2022-10-23 stsp 		    nitems(write_capabilities));
1073 13b2bc37 2022-10-23 stsp 		if (err)
1074 13b2bc37 2022-10-23 stsp 			goto done;
1075 13b2bc37 2022-10-23 stsp 	}
1076 13b2bc37 2022-10-23 stsp done:
1077 13b2bc37 2022-10-23 stsp 	free(old_id_str);
1078 13b2bc37 2022-10-23 stsp 	free(new_id_str);
1079 13b2bc37 2022-10-23 stsp 	free(client_capabilities);
1080 13b2bc37 2022-10-23 stsp 	if (err) {
1081 13b2bc37 2022-10-23 stsp 		free(*refname);
1082 13b2bc37 2022-10-23 stsp 		*refname = NULL;
1083 13b2bc37 2022-10-23 stsp 	}
1084 13b2bc37 2022-10-23 stsp 	return err;
1085 13b2bc37 2022-10-23 stsp }
1086 13b2bc37 2022-10-23 stsp 
1087 13b2bc37 2022-10-23 stsp static const struct got_error *
1088 13b2bc37 2022-10-23 stsp recv_ref_update(int *report_status, int outfd, struct imsgbuf *ibuf,
1089 13b2bc37 2022-10-23 stsp     char *buf, size_t len, int expect_capabilities, int chattygot)
1090 13b2bc37 2022-10-23 stsp {
1091 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
1092 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref_update iref;
1093 13b2bc37 2022-10-23 stsp 	struct ibuf *wbuf;
1094 13b2bc37 2022-10-23 stsp 	char *capabilities_str = NULL, *refname = NULL;
1095 13b2bc37 2022-10-23 stsp 	int done = 0;
1096 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1097 13b2bc37 2022-10-23 stsp 
1098 13b2bc37 2022-10-23 stsp 	memset(&iref, 0, sizeof(iref));
1099 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
1100 13b2bc37 2022-10-23 stsp 
1101 13b2bc37 2022-10-23 stsp 	err = parse_ref_update_line(&capabilities_str, &refname,
1102 13b2bc37 2022-10-23 stsp 	    iref.old_id, iref.new_id, buf, len);
1103 13b2bc37 2022-10-23 stsp 	if (err)
1104 13b2bc37 2022-10-23 stsp 		return err;
1105 13b2bc37 2022-10-23 stsp 
1106 13b2bc37 2022-10-23 stsp 	if (capabilities_str) {
1107 13b2bc37 2022-10-23 stsp 		if (!expect_capabilities) {
1108 13b2bc37 2022-10-23 stsp 			err = got_error_msg(GOT_ERR_BAD_PACKET,
1109 13b2bc37 2022-10-23 stsp 			    "unexpected capability announcement received");
1110 13b2bc37 2022-10-23 stsp 			goto done;
1111 13b2bc37 2022-10-23 stsp 		}
1112 13b2bc37 2022-10-23 stsp 		err = send_capabilities(NULL, report_status, capabilities_str,
1113 13b2bc37 2022-10-23 stsp 		    ibuf);
1114 13b2bc37 2022-10-23 stsp 		if (err)
1115 13b2bc37 2022-10-23 stsp 			goto done;
1116 13b2bc37 2022-10-23 stsp 	}
1117 13b2bc37 2022-10-23 stsp 
1118 13b2bc37 2022-10-23 stsp 	iref.name_len = strlen(refname);
1119 13b2bc37 2022-10-23 stsp 	len = sizeof(iref) + iref.name_len;
1120 13b2bc37 2022-10-23 stsp 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF_UPDATE, 0, 0, len);
1121 13b2bc37 2022-10-23 stsp 	if (wbuf == NULL) {
1122 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_create REF_UPDATE");
1123 13b2bc37 2022-10-23 stsp 		goto done;
1124 13b2bc37 2022-10-23 stsp 	}
1125 13b2bc37 2022-10-23 stsp 
1126 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, &iref, sizeof(iref)) == -1)
1127 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add REF_UPDATE");
1128 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, refname, iref.name_len) == -1)
1129 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add REF_UPDATE");
1130 13b2bc37 2022-10-23 stsp 	wbuf->fd = -1;
1131 13b2bc37 2022-10-23 stsp 	imsg_close(ibuf, wbuf);
1132 13b2bc37 2022-10-23 stsp 
1133 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
1134 13b2bc37 2022-10-23 stsp 	if (err)
1135 13b2bc37 2022-10-23 stsp 		goto done;
1136 13b2bc37 2022-10-23 stsp 
1137 13b2bc37 2022-10-23 stsp 	/* Wait for ACK or an error. */
1138 13b2bc37 2022-10-23 stsp 	while (!done && err == NULL) {
1139 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
1140 13b2bc37 2022-10-23 stsp 		if (err)
1141 13b2bc37 2022-10-23 stsp 			break;
1142 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1143 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1144 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
1145 13b2bc37 2022-10-23 stsp 			break;
1146 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ACK:
1147 13b2bc37 2022-10-23 stsp 			err = recv_ack(&imsg, iref.new_id);
1148 13b2bc37 2022-10-23 stsp 			if (err)
1149 13b2bc37 2022-10-23 stsp 				break;
1150 13b2bc37 2022-10-23 stsp 			done = 1;
1151 13b2bc37 2022-10-23 stsp 			break;
1152 13b2bc37 2022-10-23 stsp 		default:
1153 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1154 13b2bc37 2022-10-23 stsp 			break;
1155 13b2bc37 2022-10-23 stsp 		}
1156 13b2bc37 2022-10-23 stsp 
1157 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1158 13b2bc37 2022-10-23 stsp 	}
1159 13b2bc37 2022-10-23 stsp done:
1160 13b2bc37 2022-10-23 stsp 	free(capabilities_str);
1161 13b2bc37 2022-10-23 stsp 	free(refname);
1162 13b2bc37 2022-10-23 stsp 	return err;
1163 13b2bc37 2022-10-23 stsp }
1164 13b2bc37 2022-10-23 stsp 
1165 13b2bc37 2022-10-23 stsp static const struct got_error *
1166 13b2bc37 2022-10-23 stsp recv_packfile(struct imsg *imsg, int infd)
1167 13b2bc37 2022-10-23 stsp {
1168 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1169 13b2bc37 2022-10-23 stsp 	size_t datalen;
1170 13b2bc37 2022-10-23 stsp 	int packfd;
1171 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1172 13b2bc37 2022-10-23 stsp 	int pack_done = 0;
1173 13b2bc37 2022-10-23 stsp 
1174 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1175 13b2bc37 2022-10-23 stsp 	if (datalen != 0)
1176 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_MSG);
1177 13b2bc37 2022-10-23 stsp 
1178 13b2bc37 2022-10-23 stsp 	if (imsg->fd == -1)
1179 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
1180 a2c12f7b 2023-01-27 op 
1181 13b2bc37 2022-10-23 stsp 	packfd = imsg->fd;
1182 13b2bc37 2022-10-23 stsp 	while (!pack_done) {
1183 13b2bc37 2022-10-23 stsp 		ssize_t r = 0;
1184 13b2bc37 2022-10-23 stsp 
1185 13b2bc37 2022-10-23 stsp 		err = got_poll_fd(infd, POLLIN, 1);
1186 13b2bc37 2022-10-23 stsp 		if (err) {
1187 13b2bc37 2022-10-23 stsp 			if (err->code != GOT_ERR_TIMEOUT)
1188 13b2bc37 2022-10-23 stsp 				break;
1189 13b2bc37 2022-10-23 stsp 			err = NULL;
1190 13b2bc37 2022-10-23 stsp 		} else {
1191 13b2bc37 2022-10-23 stsp 			r = read(infd, buf, sizeof(buf));
1192 13b2bc37 2022-10-23 stsp 			if (r == -1) {
1193 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("read");
1194 13b2bc37 2022-10-23 stsp 				break;
1195 13b2bc37 2022-10-23 stsp 			}
1196 13b2bc37 2022-10-23 stsp 			if (r == 0) {
1197 13b2bc37 2022-10-23 stsp 				/*
1198 13b2bc37 2022-10-23 stsp 				 * Git clients hang up their side of the
1199 13b2bc37 2022-10-23 stsp 				 * connection after sending the pack file.
1200 13b2bc37 2022-10-23 stsp 				 */
1201 13b2bc37 2022-10-23 stsp 				err = NULL;
1202 13b2bc37 2022-10-23 stsp 				pack_done = 1;
1203 13b2bc37 2022-10-23 stsp 				break;
1204 13b2bc37 2022-10-23 stsp 			}
1205 13b2bc37 2022-10-23 stsp 		}
1206 13b2bc37 2022-10-23 stsp 
1207 13b2bc37 2022-10-23 stsp 		if (r == 0) {
1208 13b2bc37 2022-10-23 stsp 			/* Detect gotd(8) closing the pack pipe when done. */
1209 13b2bc37 2022-10-23 stsp 			err = got_poll_fd(packfd, POLLOUT, 1);
1210 13b2bc37 2022-10-23 stsp 			if (err) {
1211 13b2bc37 2022-10-23 stsp 				if (err->code != GOT_ERR_EOF)
1212 13b2bc37 2022-10-23 stsp 					break;
1213 13b2bc37 2022-10-23 stsp 				err = NULL;
1214 13b2bc37 2022-10-23 stsp 				pack_done = 1;
1215 13b2bc37 2022-10-23 stsp 			}
1216 13b2bc37 2022-10-23 stsp 		} else {
1217 13b2bc37 2022-10-23 stsp 			/* Write pack data and/or detect pipe being closed. */
1218 13b2bc37 2022-10-23 stsp 			err = got_poll_write_full(packfd, buf, r);
1219 13b2bc37 2022-10-23 stsp 			if (err) {
1220 13b2bc37 2022-10-23 stsp 				if (err->code == GOT_ERR_EOF)
1221 13b2bc37 2022-10-23 stsp 					err = NULL;
1222 13b2bc37 2022-10-23 stsp 				break;
1223 13b2bc37 2022-10-23 stsp 			}
1224 13b2bc37 2022-10-23 stsp 		}
1225 13b2bc37 2022-10-23 stsp 	}
1226 13b2bc37 2022-10-23 stsp 
1227 13b2bc37 2022-10-23 stsp 	close(packfd);
1228 13b2bc37 2022-10-23 stsp 	return err;
1229 13b2bc37 2022-10-23 stsp }
1230 13b2bc37 2022-10-23 stsp 
1231 13b2bc37 2022-10-23 stsp static const struct got_error *
1232 13b2bc37 2022-10-23 stsp report_unpack_status(struct imsg *imsg, int outfd, int chattygot)
1233 13b2bc37 2022-10-23 stsp {
1234 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1235 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_packfile_status istatus;
1236 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1237 13b2bc37 2022-10-23 stsp 	size_t datalen, len;
1238 13b2bc37 2022-10-23 stsp 	char *reason = NULL;
1239 13b2bc37 2022-10-23 stsp 
1240 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1241 13b2bc37 2022-10-23 stsp 	if (datalen < sizeof(istatus))
1242 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1243 13b2bc37 2022-10-23 stsp 	memcpy(&istatus, imsg->data, sizeof(istatus));
1244 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(istatus) + istatus.reason_len)
1245 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1246 13b2bc37 2022-10-23 stsp 
1247 00b3e9ae 2023-01-11 op 	reason = strndup(imsg->data + sizeof(istatus), istatus.reason_len);
1248 13b2bc37 2022-10-23 stsp 	if (reason == NULL) {
1249 00b3e9ae 2023-01-11 op 		err = got_error_from_errno("strndup");
1250 13b2bc37 2022-10-23 stsp 		goto done;
1251 13b2bc37 2022-10-23 stsp 	}
1252 13b2bc37 2022-10-23 stsp 
1253 13b2bc37 2022-10-23 stsp 	if (err == NULL)
1254 13b2bc37 2022-10-23 stsp 		len = snprintf(buf, sizeof(buf), "unpack ok\n");
1255 13b2bc37 2022-10-23 stsp 	else
1256 13b2bc37 2022-10-23 stsp 		len = snprintf(buf, sizeof(buf), "unpack %s\n", reason);
1257 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf)) {
1258 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NO_SPACE);
1259 13b2bc37 2022-10-23 stsp 		goto done;
1260 13b2bc37 2022-10-23 stsp 	}
1261 13b2bc37 2022-10-23 stsp 
1262 13b2bc37 2022-10-23 stsp 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1263 13b2bc37 2022-10-23 stsp done:
1264 13b2bc37 2022-10-23 stsp 	free(reason);
1265 13b2bc37 2022-10-23 stsp 	return err;
1266 13b2bc37 2022-10-23 stsp }
1267 13b2bc37 2022-10-23 stsp 
1268 13b2bc37 2022-10-23 stsp static const struct got_error *
1269 13b2bc37 2022-10-23 stsp recv_ref_update_ok(struct imsg *imsg, int outfd, int chattygot)
1270 13b2bc37 2022-10-23 stsp {
1271 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1272 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref_update_ok iok;
1273 13b2bc37 2022-10-23 stsp 	size_t datalen, len;
1274 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1275 13b2bc37 2022-10-23 stsp 	char *refname = NULL;
1276 13b2bc37 2022-10-23 stsp 
1277 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1278 13b2bc37 2022-10-23 stsp 	if (datalen < sizeof(iok))
1279 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1280 13b2bc37 2022-10-23 stsp 	memcpy(&iok, imsg->data, sizeof(iok));
1281 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(iok) + iok.name_len)
1282 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1283 13b2bc37 2022-10-23 stsp 
1284 13b2bc37 2022-10-23 stsp 	memcpy(&iok, imsg->data, sizeof(iok));
1285 13b2bc37 2022-10-23 stsp 
1286 00b3e9ae 2023-01-11 op 	refname = strndup(imsg->data + sizeof(iok), iok.name_len);
1287 13b2bc37 2022-10-23 stsp 	if (refname == NULL)
1288 00b3e9ae 2023-01-11 op 		return got_error_from_errno("strndup");
1289 13b2bc37 2022-10-23 stsp 
1290 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "ok %s\n", refname);
1291 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf)) {
1292 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NO_SPACE);
1293 13b2bc37 2022-10-23 stsp 		goto done;
1294 13b2bc37 2022-10-23 stsp 	}
1295 13b2bc37 2022-10-23 stsp 
1296 13b2bc37 2022-10-23 stsp 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1297 13b2bc37 2022-10-23 stsp done:
1298 13b2bc37 2022-10-23 stsp 	free(refname);
1299 13b2bc37 2022-10-23 stsp 	return err;
1300 13b2bc37 2022-10-23 stsp }
1301 13b2bc37 2022-10-23 stsp 
1302 13b2bc37 2022-10-23 stsp static const struct got_error *
1303 13b2bc37 2022-10-23 stsp recv_ref_update_ng(struct imsg *imsg, int outfd, int chattygot)
1304 13b2bc37 2022-10-23 stsp {
1305 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1306 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref_update_ng ing;
1307 13b2bc37 2022-10-23 stsp 	size_t datalen, len;
1308 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1309 13b2bc37 2022-10-23 stsp 	char *refname = NULL, *reason = NULL;
1310 13b2bc37 2022-10-23 stsp 
1311 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1312 13b2bc37 2022-10-23 stsp 	if (datalen < sizeof(ing))
1313 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1314 13b2bc37 2022-10-23 stsp 	memcpy(&ing, imsg->data, sizeof(ing));
1315 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(ing) + ing.name_len + ing.reason_len)
1316 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1317 13b2bc37 2022-10-23 stsp 
1318 13b2bc37 2022-10-23 stsp 	memcpy(&ing, imsg->data, sizeof(ing));
1319 13b2bc37 2022-10-23 stsp 
1320 00b3e9ae 2023-01-11 op 	refname = strndup(imsg->data + sizeof(ing), ing.name_len);
1321 13b2bc37 2022-10-23 stsp 	if (refname == NULL)
1322 00b3e9ae 2023-01-11 op 		return got_error_from_errno("strndup");
1323 13b2bc37 2022-10-23 stsp 
1324 00b3e9ae 2023-01-11 op 	reason = strndup(imsg->data + sizeof(ing) + ing.name_len,
1325 00b3e9ae 2023-01-11 op 	    ing.reason_len);
1326 13b2bc37 2022-10-23 stsp 	if (reason == NULL) {
1327 00b3e9ae 2023-01-11 op 		err = got_error_from_errno("strndup");
1328 13b2bc37 2022-10-23 stsp 		goto done;
1329 13b2bc37 2022-10-23 stsp 	}
1330 13b2bc37 2022-10-23 stsp 
1331 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "ng %s %s\n", refname, reason);
1332 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf)) {
1333 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NO_SPACE);
1334 13b2bc37 2022-10-23 stsp 		goto done;
1335 13b2bc37 2022-10-23 stsp 	}
1336 13b2bc37 2022-10-23 stsp 
1337 13b2bc37 2022-10-23 stsp 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1338 13b2bc37 2022-10-23 stsp done:
1339 13b2bc37 2022-10-23 stsp 	free(refname);
1340 13b2bc37 2022-10-23 stsp 	free(reason);
1341 13b2bc37 2022-10-23 stsp 	return err;
1342 13b2bc37 2022-10-23 stsp }
1343 13b2bc37 2022-10-23 stsp 
1344 13b2bc37 2022-10-23 stsp static const struct got_error *
1345 13b2bc37 2022-10-23 stsp serve_write(int infd, int outfd, int gotd_sock, const char *repo_path,
1346 13b2bc37 2022-10-23 stsp     int chattygot)
1347 13b2bc37 2022-10-23 stsp {
1348 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1349 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1350 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
1351 13b2bc37 2022-10-23 stsp 	enum protostate {
1352 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_REF_UPDATE,
1353 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_MORE_REF_UPDATES,
1354 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_PACKFILE,
1355 13b2bc37 2022-10-23 stsp 		STATE_PACKFILE_RECEIVED,
1356 13b2bc37 2022-10-23 stsp 		STATE_REFS_UPDATED,
1357 13b2bc37 2022-10-23 stsp 	};
1358 13b2bc37 2022-10-23 stsp 	enum protostate curstate = STATE_EXPECT_REF_UPDATE;
1359 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1360 13b2bc37 2022-10-23 stsp 	int report_status = 0;
1361 13b2bc37 2022-10-23 stsp 
1362 13b2bc37 2022-10-23 stsp 	imsg_init(&ibuf, gotd_sock);
1363 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
1364 13b2bc37 2022-10-23 stsp 
1365 13b2bc37 2022-10-23 stsp 	err = announce_refs(outfd, &ibuf, 0, repo_path, chattygot);
1366 13b2bc37 2022-10-23 stsp 	if (err)
1367 13b2bc37 2022-10-23 stsp 		goto done;
1368 13b2bc37 2022-10-23 stsp 
1369 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_EXPECT_PACKFILE) {
1370 13b2bc37 2022-10-23 stsp 		int n;
1371 13b2bc37 2022-10-23 stsp 		buf[0] = '\0';
1372 13b2bc37 2022-10-23 stsp 		err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot);
1373 13b2bc37 2022-10-23 stsp 		if (err)
1374 f3dfebfc 2023-01-23 stsp 			goto done;
1375 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1376 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1377 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
1378 13b2bc37 2022-10-23 stsp 				    "unexpected flush packet received");
1379 13b2bc37 2022-10-23 stsp 				goto done;
1380 13b2bc37 2022-10-23 stsp 			}
1381 13b2bc37 2022-10-23 stsp 			err = forward_flushpkt(&ibuf);
1382 13b2bc37 2022-10-23 stsp 			if (err)
1383 13b2bc37 2022-10-23 stsp 				goto done;
1384 13b2bc37 2022-10-23 stsp 			curstate = STATE_EXPECT_PACKFILE;
1385 13b2bc37 2022-10-23 stsp 		} else if (n >= (SHA1_DIGEST_STRING_LENGTH * 2) + 2) {
1386 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_REF_UPDATE &&
1387 13b2bc37 2022-10-23 stsp 			    curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1388 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
1389 13b2bc37 2022-10-23 stsp 				    "unexpected ref-update packet");
1390 13b2bc37 2022-10-23 stsp 				goto done;
1391 13b2bc37 2022-10-23 stsp 			}
1392 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_REF_UPDATE) {
1393 13b2bc37 2022-10-23 stsp 				err = recv_ref_update(&report_status,
1394 13b2bc37 2022-10-23 stsp 				    outfd, &ibuf, buf, n, 1, chattygot);
1395 13b2bc37 2022-10-23 stsp 			} else {
1396 13b2bc37 2022-10-23 stsp 				err = recv_ref_update(NULL, outfd, &ibuf,
1397 13b2bc37 2022-10-23 stsp 				    buf, n, 0, chattygot);
1398 13b2bc37 2022-10-23 stsp 			}
1399 13b2bc37 2022-10-23 stsp 			if (err)
1400 13b2bc37 2022-10-23 stsp 				goto done;
1401 13b2bc37 2022-10-23 stsp 			curstate = STATE_EXPECT_MORE_REF_UPDATES;
1402 13b2bc37 2022-10-23 stsp 		} else {
1403 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_BAD_PACKET);
1404 13b2bc37 2022-10-23 stsp 			goto done;
1405 13b2bc37 2022-10-23 stsp 		}
1406 13b2bc37 2022-10-23 stsp 	}
1407 13b2bc37 2022-10-23 stsp 
1408 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_PACKFILE_RECEIVED) {
1409 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1410 13b2bc37 2022-10-23 stsp 		if (err)
1411 13b2bc37 2022-10-23 stsp 			goto done;
1412 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1413 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1414 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
1415 13b2bc37 2022-10-23 stsp 			goto done;
1416 7fec5f4a 2022-10-28 stsp 		case GOTD_IMSG_PACKFILE_PIPE:
1417 13b2bc37 2022-10-23 stsp 			err = recv_packfile(&imsg, infd);
1418 13b2bc37 2022-10-23 stsp 			if (err) {
1419 13b2bc37 2022-10-23 stsp 				if (err->code != GOT_ERR_EOF)
1420 13b2bc37 2022-10-23 stsp 					goto done;
1421 13b2bc37 2022-10-23 stsp 				/*
1422 13b2bc37 2022-10-23 stsp 				 * EOF is reported when the client hangs up,
1423 13b2bc37 2022-10-23 stsp 				 * which can happen with Git clients.
1424 13b2bc37 2022-10-23 stsp 				 * The socket should stay half-open so we
1425 13b2bc37 2022-10-23 stsp 				 * can still send our reports if requested.
1426 13b2bc37 2022-10-23 stsp 				 */
1427 13b2bc37 2022-10-23 stsp 				err = NULL;
1428 13b2bc37 2022-10-23 stsp 			}
1429 13b2bc37 2022-10-23 stsp 			curstate = STATE_PACKFILE_RECEIVED;
1430 13b2bc37 2022-10-23 stsp 			break;
1431 13b2bc37 2022-10-23 stsp 		default:
1432 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1433 13b2bc37 2022-10-23 stsp 			break;
1434 13b2bc37 2022-10-23 stsp 		}
1435 13b2bc37 2022-10-23 stsp 
1436 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1437 13b2bc37 2022-10-23 stsp 		if (err)
1438 13b2bc37 2022-10-23 stsp 			goto done;
1439 13b2bc37 2022-10-23 stsp 	}
1440 13b2bc37 2022-10-23 stsp 
1441 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_REFS_UPDATED && err == NULL) {
1442 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1443 13b2bc37 2022-10-23 stsp 		if (err)
1444 13b2bc37 2022-10-23 stsp 			break;
1445 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1446 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1447 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
1448 13b2bc37 2022-10-23 stsp 			break;
1449 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_PACKFILE_STATUS:
1450 13b2bc37 2022-10-23 stsp 			if (!report_status)
1451 13b2bc37 2022-10-23 stsp 				break;
1452 13b2bc37 2022-10-23 stsp 			err = report_unpack_status(&imsg, outfd, chattygot);
1453 13b2bc37 2022-10-23 stsp 			break;
1454 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REF_UPDATE_OK:
1455 13b2bc37 2022-10-23 stsp 			if (!report_status)
1456 13b2bc37 2022-10-23 stsp 				break;
1457 13b2bc37 2022-10-23 stsp 			err = recv_ref_update_ok(&imsg, outfd, chattygot);
1458 13b2bc37 2022-10-23 stsp 			break;
1459 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REF_UPDATE_NG:
1460 13b2bc37 2022-10-23 stsp 			if (!report_status)
1461 13b2bc37 2022-10-23 stsp 				break;
1462 13b2bc37 2022-10-23 stsp 			err = recv_ref_update_ng(&imsg, outfd, chattygot);
1463 13b2bc37 2022-10-23 stsp 			break;
1464 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REFS_UPDATED:
1465 13b2bc37 2022-10-23 stsp 			curstate = STATE_REFS_UPDATED;
1466 13b2bc37 2022-10-23 stsp 			err = got_pkt_flushpkt(outfd, chattygot);
1467 13b2bc37 2022-10-23 stsp 			break;
1468 13b2bc37 2022-10-23 stsp 		default:
1469 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1470 13b2bc37 2022-10-23 stsp 			break;
1471 13b2bc37 2022-10-23 stsp 		}
1472 13b2bc37 2022-10-23 stsp 
1473 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1474 13b2bc37 2022-10-23 stsp 	}
1475 13b2bc37 2022-10-23 stsp done:
1476 13b2bc37 2022-10-23 stsp 	imsg_clear(&ibuf);
1477 13b2bc37 2022-10-23 stsp 	if (err)
1478 13b2bc37 2022-10-23 stsp 		echo_error(err, outfd, chattygot);
1479 13b2bc37 2022-10-23 stsp 	return err;
1480 13b2bc37 2022-10-23 stsp }
1481 13b2bc37 2022-10-23 stsp 
1482 13b2bc37 2022-10-23 stsp const struct got_error *
1483 9aeaf23a 2023-01-22 op got_serve(int infd, int outfd, const char *command, const char *repo_path,
1484 9aeaf23a 2023-01-22 op     int gotd_sock, int chattygot)
1485 13b2bc37 2022-10-23 stsp {
1486 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1487 13b2bc37 2022-10-23 stsp 
1488 13b2bc37 2022-10-23 stsp 	if (strcmp(command, GOT_SERVE_CMD_FETCH) == 0)
1489 13b2bc37 2022-10-23 stsp 		err = serve_read(infd, outfd, gotd_sock, repo_path, chattygot);
1490 13b2bc37 2022-10-23 stsp 	else if (strcmp(command, GOT_SERVE_CMD_SEND) == 0)
1491 c808f450 2023-01-22 op 		err = serve_write(infd, outfd, gotd_sock, repo_path,
1492 c808f450 2023-01-22 op 		    chattygot);
1493 13b2bc37 2022-10-23 stsp 	else
1494 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_BAD_PACKET);
1495 13b2bc37 2022-10-23 stsp 
1496 13b2bc37 2022-10-23 stsp 	return err;
1497 13b2bc37 2022-10-23 stsp }